Mrrzy: I don't know how far out. There may be regulations concerning that since we lost two subs to undisclosed reasons in the 1960s, The Thresher and the Scorpian, one of which was doing precisely that sort of excersize when it was lost but don't ask me which. As to the U.S. telling evryone else what to do, let's not confuse politicians with real people. Kindest reguards, Neil